2-18z作业检查

来源：2-18 编程练习

请老师大大检查作业

2021-11-19 14:09:01

相关代码：

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>2-9</title>
    <style type="text/css">
        div {
            font-family: Arial;
            font-size: 72px;
            font-weight: bold;
            position: fixed;
            right: 0;
            left: 0;
            bottom:50px;
            width: 30px;
            height: 30px;
            margin: auto;
            transform: rotate(90deg);
            /*此处写代码*/
            animation:gundong 1s ease-in .5s infinite ;
            }
            @keyframes gundong {
                0%{
                    bottom:50px;
                 }
                50%{
                    bottom:25px;
                }
                75%{
                    bottom:30px;
                }
                100%{
                    bottom:20px;
                }
            }
    </style>
</head>
<body>
    <div>&gt;</div>
</body>
</html>

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